User Manual

DescriptionItem
hydraulic grip supply. Each grip has two hydraulic lines connected to
it; a hydraulic pressure port and a hydraulic return port.
Contacts and holds the specimen in place. A variety of wedges are
available, for flat specimens, round specimens, hard specimens, and
soft specimens. Wedges are available as matched sets of four.
Wedges
Each model has wedges that are designed for its use. The 647.250
grips have permanent wedges and use wedge liners to accommodate
various specimen shapes.
Helps align the specimen when it is installed. The specimen guide
can only be used with flat specimens.
Specimen guide
Applies axial or axial and torsional forces to specimens. The actuator
is a hydraulically powered device that provides linear displacement
Actuator rod
of (or forces into) a specimen. For axial-torsional systems, the actuator
applies both axial and torsional forces to the specimen.
The end of the actuator rod is threaded so that a grip can be mounted
to it. The actuator rod can be located in the base or the crosshead of
the load unit.
Provides the source of water for heating or cooling. The water is
circulated through the grips to keep them warm or cool when operating
in a cold or hot environmental chamber.
Water cooling lines
Allows a specimen to be tested at different temperatures (hot or cold).
Environmental chambers are insulated boxes that surround the
specimen and grips.
Environmental chamber
Includes the required components to install the grips. The attachment
kit contains shim washers, spiral washers, and connector studs. Each
grip model/load unit model combination has a unique attachment kit.
Axial attachment kit
Allows the upper and lower grips to be aligned. When the grips are
installed, the upper and lower grips might not be aligned. Shims can
• Shims
be added so that the grips are aligned when they are tightened on
the connector stud. The shims are available in thicknesses that
correspond with 1/8 to 1/2 turns.
Ensures preloading without inducing offsets in the force train. They
provide a backlash-free union of threaded components. They preload
• Spiral washers
the connecting stud to a minimum axial load that is 110% of the test
maximum.
Mounts the grips to the other components in the force train. Connector
studs are threaded rods that connect the grips with an actuator rod
or force transducer.
• Connector stud
Includes the required components to install the grips. The attachment
kit contains an adapter plate, an upper coupling, and a lower coupling.
Axial-torsional attachment
kit
Each grip model/load unit model combination has a unique attachment
kit.
18 Series 647 Hydraulic Wedge Grips Reference Manual
Introduction